Sink drain



FIG. 1 is a perspective view of the sink drain in a sink.

FIG. 2 is a perspective view of the sink drain in a sink.

FIG. 3 is a sectional view taken along line 3-3 as shown in FIG. 5 of the sink drain.

FIG. 4 is a an enlarged sectional view taken from line 4 as shown in FIG. 3 of the sink drain.

FIG. 5 is a plan view of the sink drain in a sink.

FIG. 6 is a plan view taken along line 6 as shown in FIG. 3 of the sink drain.

FIG. 7 is a perspective view of the sink drain shown removed from the sink; and,

FIG. 8 is an exploded side view of the sink drain shown removed from the sink.

The broken line showing is included for the purpose of illustrative purposes and form no part of the claimed design. 

The ornamental design for a sink drain, as shown and described. 